Homes



June 12, 1928. Re. 16,992 I H. A; "THRUSH PRESSURE RELIEF VALVE Original Filed July 9. 1920 2 Sheets-Sheet 1 June 12, 1928. Re. 16,992

H.-A.YTHRUSH PRES SURE RBLI EF VALVE Original Filed July 9. 2 2 Sheets-Sheet 2 Mew/222 jfibrner 97. 170714670,

r vi Y 07x9.

HOMER A. :rH'RUsH,

valves,

Reissuecl June 12,1928;

cayenne, INDIANA.

PRESSURE-RELIEF VALVE;

Original no. 1,454,353, dated 'May a, 1923, Serial No. 394,957, fllediluly 9,1920. Apiflication for 1 reissue filed Ju1y-28, 1924. Serial No. 728,794.

This invention relates to pressure relief for use wherever found appropriate. It is shown herein in connection with boilers and radiators for heating purposes, with which it is peculiarly useful. 1 The prime feature of the invention is in so constructing and applying the reliefvalve in such a system that the return or cooled waterwill be dischargedfrom the overflow in order to relieve any excess pressure in the boiler 01' radiators.

A further feature of the invention is the provision of a diaphragmwhich recelves the excess pressureifrom the water in the boiler and radiators and automatically opens the valve, the stem of the .valve ha-vlng means associated therewith for regulatlngthe pressure required forunseating the valve. Like wise, the stem is in a manner fieXibly'con nected with the ,valve proper so that the valve may yield to compensate for any inequalities in the valve seat or the contacting face of the valve. 1

Other objects and advantageswill be hereinafter morefully set forth and pointed out in the accompanying spccificatiomand other uses will readily suggest themselves to those skilled in the art. l

In the accompanying drawings which are made a part of this application,

Figure 1. is a detail of elevation of a'heat- Qing system showing the pressure relief valve atta'ched thereto,

sectional view through the relief valve showing the same on an. enlarged scaletwith the valve in closed position, and

Figure 3, is a similar view withthe valve inopenposition. i

Referring to the accompanying drawings in which similar refercncecharacters denote corresponding parts throughout the several views, -1 indicates a boiler or heater which may be of the usual or any preferred constrilction, preferably used in dwellings for heating the same, and connected with said heater and preferably adjacent to the upper endt-hereof, is a flow main 2 through which the heated Water is conveyed into one or more radiators 3, sa1d main Qbeing preferv ably" carried in elevated 'POSltIOII above the heater and radiator so as to obtainproper circulation of the water.

In heating systems of this class it is necessary to provide means for regulating the pressure in the flow pipes and radiators and toreadily accomplish this result and at the same time preserve the heating water and cause the condensate or cooled water to leave the pipe line and radiators,.the valve structure 4 is connected through an extension pipe 5 with thereturn main 6, consequently such water as is forced from the heating plant when an excess pressure occurs will be the return or cooled water, thereby retaining the heated water in thesystem at all times.

The valvestructure 4L comprisesaivalve housing 7 whichgis. connected to the upper end of the extension pipe 5, and above said housing is a cylindrical casing 8, the housing andcasing being separated by a partition 9. Nhile the device is shown as having a' cylindrical outer wall and a rounded cap it may be embodied invarious other shapes. Mov

ably mounted in the housing 7 is a valve 10, a

the stem 11 of which ,passes upwardly through a port 12 in the partition 9, the upper face of the partition having a sleeve 13 thereon for guidingthe valve stem 11, and

to insuret-h'at the valve 10 will properly seat,

the stem '11 is preferably formed in sections and these sections pivoted together and thus lend flexibility to the valve.

The valve 10 is normally held seated by a spring 14 which surroundst-he upper end of the stem 11 and has one of its ends resting on the upper end of the sleeve 13 whilethe opposite end of thespring engages in ad- Figure 2, is a central transverse, vertical justing nut 15 which threads on the upper end of the valve stem 11. By adjusting the j nut 15 on the valvestem theflprjessure'required tounseat-the valve may be varied.

Immediatelyabovetlie nut 15 and thee-11d of the valve stem co-operating therewith, is

a diaphragm 16, the edges of which are coni fined between the upper end of the casing 8 and a cap 17 the 'cap 17 being hollow .to

form a cavity 18 above the diaphragm and by extending a by-pass 19 from the housing 7 to: the cavity 18 throughthe walls of the housing, casing and cap, the pressure of the water in the heating system will be directed 1 against the upper face of the diaphragm and when increased above a specified degree, the pressure will force the diaphragm down 1 wardly and release the valve from its seat.- v

' apairof minor chambersa-t opposite ends of the main chamber, such arrangement being, ofcourse, subject to change within the,

overflow pipe 20, the flow of the Water continuing until the pressure within theheating system is relieved. As soonas the pressure in the heating system has again become normal the diaphragm 16 will elevate to its nor-, mal position therebyreleasingthe valve 10 and permitting the spring 14v to again seat.

the valve against the partition 9 and cut off the flow of the water through the port and overflow-pipe- I Should it be desired to attain a higher degree of temperature of the water before the pressure I relief valve automatically operates the nut 15 is to be turned downwardly on the valve stem 11 thereby increasing the tension oft-he spring l t and requiring a great- "will found useful in many types of appae'r' pressure in the heating system for unseatingthevalve. In effect the partition and diaphragmdivide the open space inside the valve into a main-chamber inthe casing and scope. of'my invention.

As will be readily understood, such device ratus where pressure relief is desirable or necessary. In employing this form of device y for controlling thepressure' of the heating to said housing,

system and attachingthe same to the return pipe 'ins'tead of directly to the heater or main flow pipe of the system. none but the cooled water Will be released from the heating system, thus maintaining the degree. of heat in thesystem at the highest degree'of efficiency.

Having thus fully described my said insecure by Letters Patent, is: v

1. A elief valve for heating systems comprising a. housing, a hollow casing attached a partition between said casing and housing having a port therethrough, a valve for normally closing said port, a; flexible stem attached to said valve,

vention, what I claim as new and desire to a diaphragm adapted to direct pressure against the upperend ofsaid stem and unseat said valve when pressure is directed thereagainstfrom the heating system, a

by-pass extending from said housing to a point above said-diaphragm, said b -pass beingformed in the walls of said housin and casing and through saidpartition, an

means-for determining the degree of pres,-

sure required for unseating said valve, sub- 'stantially as set forth.

2. A pressurerelief valve for heating systemscomprising a hous1ng,a casing cooperatingwith said housing, a partition be-v tween said casing and housing having a port tially as set forth.

therethroug h a valve in said housing for to said valve, a, diaphragm above said stem closing said port, a. stem flexibly connected adapted to be operated by the pressure from i the heating system for unseating said valve, a by-pass extending from said housing to a point above; said diaphragm, said hy-pass being formed. in the walls of said housinghaving a central port, a. hollowfsleeve surrounding said port, a valve for closingsaid port, a flexible shaft carrying said valve and projecting upwardly through said port and sleeve, a. diaphragm above said stem and adapted to directdownward pressure thereon for opening said valve, a spring} for normally'holding said valve closed, means threaded onto said stem for regulating the tension of said spring, and a by-pass extendingfrom said housing to a point .above sa d diaphragm and through the walls of said hous1ng,'casing and partitiomsubstan- 4. A pressure valve, comprising a housing, a casing abovesaid housing, a partition between said housing and caslng, said paratition having a central port, a dlaphragm at,

the upper end, of said casing, a cap forming a cavity above said diaphragm, avalve for closing said port, a flexible stem carrying said valve, adjustable means at the upper end of said stem for engagement with said diaphragm, and a by-pass extending through the walls of said housing, partition, cdsing,

and cap for conveying heating medium from said housing 'to said cavity above 'said diaphragm, substantially as set forth.

' 5. A relief valve for'heating systems com prisingla housing, a casing,- a partition between said housing and easing, a cavity, at

the upper end of said casing, a diaphragm between said casingand cavity, a-valve operable bysaid diaphragm, and a by-pass extending from saidhousing to said cavity and formed in the walls of the housing and casing and through said partition, substantiallyas set forth. v v In witness whereof, I have hereunto set its my hand at Peru, Indiana, this'26th day of July, A. D. nineteen hundred and twentyfour. 1

HOMER A. THRUSH, I 

